// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

package config

import (
	"bytes"
	"path/filepath"
	"text/template"

	"github.com/kumose/kmopt/embed"
	"github.com/kumose/kmopt/pkg/utils"
)

// TiSparkConfig represent the data to generate TiSpark configs
type TiSparkConfig struct {
	TiSparkMasters string
	CustomFields   map[string]any
	Endpoints      []string
}

// NewTiSparkConfig returns a TiSparkConfig
func NewTiSparkConfig(pds []string) *TiSparkConfig {
	return &TiSparkConfig{Endpoints: pds}
}

// WithMasters sets master address
func (c *TiSparkConfig) WithMasters(masters string) *TiSparkConfig {
	c.TiSparkMasters = masters
	return c
}

// WithCustomFields sets custom setting fields
func (c *TiSparkConfig) WithCustomFields(m map[string]any) *TiSparkConfig {
	c.CustomFields = m
	return c
}

// Config generate the config file data.
func (c *TiSparkConfig) Config() ([]byte, error) {
	fp := filepath.Join("templates", "config", "spark-defaults.conf.tpl")
	tpl, err := embed.ReadTemplate(fp)
	if err != nil {
		return nil, err
	}
	return c.ConfigWithTemplate(string(tpl))
}

// ConfigToFile write config content to specific path
func (c *TiSparkConfig) ConfigToFile(file string) error {
	config, err := c.Config()
	if err != nil {
		return err
	}
	return utils.WriteFile(file, config, 0755)
}

// ConfigWithTemplate parses the template file
func (c *TiSparkConfig) ConfigWithTemplate(tpl string) ([]byte, error) {
	tmpl, err := template.New("TiSpark").Parse(tpl)
	if err != nil {
		return nil, err
	}

	content := bytes.NewBufferString("")
	if err := tmpl.Execute(content, c); err != nil {
		return nil, err
	}

	return content.Bytes(), nil
}
